Lewis & Short

pōtōrĭus, a, um, adj. [potor],

  1. I. of or belonging to drinking, drinking- (post-Aug.): potoria vasa, Plin. 36, 7, 12, § 59: argentum, silver drinking-vessels, Dig. 34, 2, 22: sil, i. e. liquidum, Pelag. Veter. 21: PRAEPOSITVS AVRI POTORII, superintendent of the golden drinking-vessels, an officer at court, Inscr. Grut. 1111, 13: AB ARGENTO POTORIO, ib. 582, 9; Inscr. Murat. 895, 2.
  2. II. Subst.: pōtōrĭum, ii, n., a drinking-vessel, goblet (post-Aug.): potoria gemmata, Plin. 37, 2, 6, § 17: aurea, id. 33, 10, 47, § 136: parvula, id. 33, 12, 55, § 157.